<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2009, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * CodeIgniter Date Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/date_helper.html
 */

// ------------------------------------------------------------------------

/**
 * Get "now" time
 *
 * Returns time() or its GMT equivalent based on the config file preference
 *
 * @access	public
 * @return	integer
 */
if ( ! function_exists('now')) {
  function now() {
    $CI =& get_instance();

    if (strtolower($CI->config->item('time_reference')) == 'gmt') {
      $now = time();
      $system_time = mktime(gmdate("H", $now), gmdate("i", $now), gmdate("s", $now), gmdate("m", $now), gmdate("d", $now), gmdate("Y", $now));

      if (strlen($system_time) < 10) {
        $system_time = time();
        log_message('error', 'The Date class could not set a proper GMT timestamp so the local time() value was used.');
      }

      return $system_time;
    }
    else {
      return time();
    }
  }
}

// ------------------------------------------------------------------------

/**
 * Convert MySQL Style Datecodes
 *
 * This function is identical to PHPs date() function,
 * except that it allows date codes to be formatted using
 * the MySQL style, where each code letter is preceded
 * with a percent sign:  %Y %m %d etc...
 *
 * The benefit of doing dates this way is that you don't
 * have to worry about escaping your text letters that
 * match the date codes.
 *
 * @access	public
 * @param	string
 * @param	integer
 * @return	integer
 */
if ( ! function_exists('mdate')) {
  function mdate($datestr = '', $time = '') {
    if ($datestr == '')
      return '';

    if ($time == '')
      $time = now();

    $datestr = str_replace('%\\', '', preg_replace("/([a-z]+?){1}/i", "\\\\\\1", $datestr));
    return date($datestr, $time);
  }
}

// ------------------------------------------------------------------------

/**
 * Standard Date
 *
 * Returns a date formatted according to the submitted standard.
 *
 * @access	public
 * @param	string	the chosen format
 * @param	integer	Unix timestamp
 * @return	string
 */
if ( ! function_exists('standard_date')) {
  function standard_date($fmt = 'DATE_RFC822', $time = '') {
    $formats = array(
        'DATE_ATOM'		=>	'%Y-%m-%dT%H:%i:%s%Q',
        'DATE_COOKIE'	=>	'%l, %d-%M-%y %H:%i:%s UTC',
        'DATE_ISO8601'	=>	'%Y-%m-%dT%H:%i:%s%O',
        'DATE_RFC822'	=>	'%D, %d %M %y %H:%i:%s %O',
        'DATE_RFC850'	=>	'%l, %d-%M-%y %H:%m:%i UTC',
        'DATE_RFC1036'	=>	'%D, %d %M %y %H:%i:%s %O',
        'DATE_RFC1123'	=>	'%D, %d %M %Y %H:%i:%s %O',
        'DATE_RSS'		=>	'%D, %d %M %Y %H:%i:%s %O',
        'DATE_W3C'		=>	'%Y-%m-%dT%H:%i:%s%Q'
    );

    if ( ! isset($formats[$fmt])) {
      return FALSE;
    }

    return mdate($formats[$fmt], $time);
  }
}

// ------------------------------------------------------------------------

/**
 * Timespan
 *
 * Returns a span of seconds in this format:
 *	10 days 14 hours 36 minutes 47 seconds
 *
 * @access	public
 * @param	integer	a number of seconds
 * @param	integer	Unix timestamp
 * @return	integer
 */
if ( ! function_exists('timespan')) {
  function timespan($seconds = 1, $time = '') {
    $CI =& get_instance();
    $CI->lang->load('date');

    if ( ! is_numeric($seconds)) {
      $seconds = 1;
    }

    if ( ! is_numeric($time)) {
      $time = time();
    }

    if ($time <= $seconds) {
      $seconds = 1;
    }
    else {
      $seconds = $time - $seconds;
    }

    $str = '';
    $years = floor($seconds / 31536000);

    if ($years > 0) {
      $str .= $years.' '.$CI->lang->line((($years	> 1) ? 'date_years' : 'date_year')).', ';
    }

    $seconds -= $years * 31536000;
    $months = floor($seconds / 2628000);

    if ($years > 0 OR $months > 0) {
      if ($months > 0) {
        $str .= $months.' '.$CI->lang->line((($months	> 1) ? 'date_months' : 'date_month')).', ';
      }

      $seconds -= $months * 2628000;
    }

    $weeks = floor($seconds / 604800);

    if ($years > 0 OR $months > 0 OR $weeks > 0) {
      if ($weeks > 0) {
        $str .= $weeks.' '.$CI->lang->line((($weeks	> 1) ? 'date_weeks' : 'date_week')).', ';
      }

      $seconds -= $weeks * 604800;
    }

    $days = floor($seconds / 86400);

    if ($months > 0 OR $weeks > 0 OR $days > 0) {
      if ($days > 0) {
        $str .= $days.' '.$CI->lang->line((($days	> 1) ? 'date_days' : 'date_day')).', ';
      }

      $seconds -= $days * 86400;
    }

    $hours = floor($seconds / 3600);

    if ($days > 0 OR $hours > 0) {
      if ($hours > 0) {
        $str .= $hours.' '.$CI->lang->line((($hours	> 1) ? 'date_hours' : 'date_hour')).', ';
      }

      $seconds -= $hours * 3600;
    }

    $minutes = floor($seconds / 60);

    if ($days > 0 OR $hours > 0 OR $minutes > 0) {
      if ($minutes > 0) {
        $str .= $minutes.' '.$CI->lang->line((($minutes	> 1) ? 'date_minutes' : 'date_minute')).', ';
      }

      $seconds -= $minutes * 60;
    }

    if ($str == '') {
      $str .= $seconds.' '.$CI->lang->line((($seconds	> 1) ? 'date_seconds' : 'date_second')).', ';
    }

    return substr(trim($str), 0, -1);
  }
}

// ------------------------------------------------------------------------

/**
 * Number of days in a month
 *
 * Takes a month/year as input and returns the number of days
 * for the given month/year. Takes leap years into consideration.
 *
 * @access	public
 * @param	integer a numeric month
 * @param	integer	a numeric year
 * @return	integer
 */
if ( ! function_exists('days_in_month')) {
  function days_in_month($month = 0, $year = '') {
    if ($month < 1 OR $month > 12) {
      return 0;
    }

    if ( ! is_numeric($year) OR strlen($year) != 4) {
      $year = date('Y');
    }

    if ($month == 2) {
      if ($year % 400 == 0 OR ($year % 4 == 0 AND $year % 100 != 0)) {
        return 29;
      }
    }

    $days_in_month	= array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
    return $days_in_month[$month - 1];
  }
}

// ------------------------------------------------------------------------

/**
 * Converts a local Unix timestamp to GMT
 *
 * @access	public
 * @param	integer Unix timestamp
 * @return	integer
 */
if ( ! function_exists('local_to_gmt')) {
  function local_to_gmt($time = '') {
    if ($time == '')
      $time = time();

    return mktime( gmdate("H", $time), gmdate("i", $time), gmdate("s", $time), gmdate("m", $time), gmdate("d", $time), gmdate("Y", $time));
  }
}

// ------------------------------------------------------------------------

/**
 * Converts GMT time to a localized value
 *
 * Takes a Unix timestamp (in GMT) as input, and returns
 * at the local value based on the timezone and DST setting
 * submitted
 *
 * @access	public
 * @param	integer Unix timestamp
 * @param	string	timezone
 * @param	bool	whether DST is active
 * @return	integer
 */
if ( ! function_exists('gmt_to_local')) {
  function gmt_to_local($time = '', $timezone = 'UTC', $dst = FALSE) {
    if ($time == '') {
      return now();
    }

    $time += timezones($timezone) * 3600;

    if ($dst == TRUE) {
      $time += 3600;
    }

    return $time;
  }
}

// ------------------------------------------------------------------------

/**
 * Converts a MySQL Timestamp to Unix
 *
 * @access	public
 * @param	integer Unix timestamp
 * @return	integer
 */
if ( ! function_exists('mysql_to_unix')) {
  function mysql_to_unix($time = '') {
  // We'll remove certain characters for backward compatibility
  // since the formatting changed with MySQL 4.1
  // YYYY-MM-DD HH:MM:SS

    $time = str_replace('-', '', $time);
    $time = str_replace(':', '', $time);
    $time = str_replace(' ', '', $time);

    // YYYYMMDDHHMMSS
    return  mktime(
    substr($time, 8, 2),
    substr($time, 10, 2),
    substr($time, 12, 2),
    substr($time, 4, 2),
    substr($time, 6, 2),
    substr($time, 0, 4)
    );
  }
}

// ------------------------------------------------------------------------

/**
 * Unix to "Human"
 *
 * Formats Unix timestamp to the following prototype: 2006-08-21 11:35 PM
 *
 * @access	public
 * @param	integer Unix timestamp
 * @param	bool	whether to show seconds
 * @param	string	format: us or euro
 * @return	string
 */
if ( ! function_exists('unix_to_human')) {
  function unix_to_human($time = '', $seconds = FALSE, $fmt = 'us') {
    $r  = date('Y', $time).'-'.date('m', $time).'-'.date('d', $time).' ';

    if ($fmt == 'us') {
      $r .= date('h', $time).':'.date('i', $time);
    }
    else {
      $r .= date('H', $time).':'.date('i', $time);
    }

    if ($seconds) {
      $r .= ':'.date('s', $time);
    }

    if ($fmt == 'us') {
      $r .= ' '.date('A', $time);
    }

    return $r;
  }
}

// ------------------------------------------------------------------------

/**
 * Convert "human" date to GMT
 *
 * Reverses the above process
 *
 * @access	public
 * @param	string	format: us or euro
 * @return	integer
 */
if ( ! function_exists('human_to_unix')) {
  function human_to_unix($datestr = '') {
    if ($datestr == '') {
      return FALSE;
    }

    $datestr = trim($datestr);
    $datestr = preg_replace("/\040+/", "\040", $datestr);

    if ( ! preg_match('/^[0-9]{2,4}\-[0-9]{1,2}\-[0-9]{1,2}\s[0-9]{1,2}:[0-9]{1,2}(?::[0-9]{1,2})?(?:\s[AP]M)?$/i', $datestr)) {
      return FALSE;
    }

    $split = preg_split("/\040/", $datestr);

    $ex = explode("-", $split['0']);

    $year  = (strlen($ex['0']) == 2) ? '20'.$ex['0'] : $ex['0'];
    $month = (strlen($ex['1']) == 1) ? '0'.$ex['1']  : $ex['1'];
    $day   = (strlen($ex['2']) == 1) ? '0'.$ex['2']  : $ex['2'];

    $ex = explode(":", $split['1']);

    $hour = (strlen($ex['0']) == 1) ? '0'.$ex['0'] : $ex['0'];
    $min  = (strlen($ex['1']) == 1) ? '0'.$ex['1'] : $ex['1'];

    if (isset($ex['2']) && preg_match('/[0-9]{1,2}/', $ex['2'])) {
      $sec  = (strlen($ex['2']) == 1) ? '0'.$ex['2'] : $ex['2'];
    }
    else {
    // Unless specified, seconds get set to zero.
      $sec = '00';
    }

    if (isset($split['2'])) {
      $ampm = strtolower($split['2']);

      if (substr($ampm, 0, 1) == 'p' AND $hour < 12)
        $hour = $hour + 12;

      if (substr($ampm, 0, 1) == 'a' AND $hour == 12)
        $hour =  '00';

      if (strlen($hour) == 1)
        $hour = '0'.$hour;
    }

    return mktime($hour, $min, $sec, $month, $day, $year);
  }
}

// ------------------------------------------------------------------------

/**
 * Timezone Menu
 *
 * Generates a drop-down menu of timezones.
 *
 * @access	public
 * @param	string	timezone
 * @param	string	classname
 * @param	string	menu name
 * @return	string
 */
if ( ! function_exists('timezone_menu')) {
  function timezone_menu($default = 'UTC', $class = "", $name = 'timezones') {
    $CI =& get_instance();
    $CI->lang->load('date');

    if ($default == 'GMT')
      $default = 'UTC';

    $menu = '<select name="'.$name.'"';

    if ($class != '') {
      $menu .= ' class="'.$class.'"';
    }

    $menu .= ">\n";

    foreach (timezones() as $key => $val) {
      $selected = ($default == $key) ? " selected='selected'" : '';
      $menu .= "<option value='{$key}'{$selected}>".$CI->lang->line($key)."</option>\n";
    }

    $menu .= "</select>";

    return $menu;
  }
}

// ------------------------------------------------------------------------

/**
 * Timezones
 *
 * Returns an array of timezones.  This is a helper function
 * for various other ones in this library
 *
 * @access	public
 * @param	string	timezone
 * @return	string
 */
if ( ! function_exists('timezones')) {
  function timezones($tz = '') {
  // Note: Don't change the order of these even though
  // some items appear to be in the wrong order

    $zones = array(
        'UM12'		=> -12,
        'UM11'		=> -11,
        'UM10'		=> -10,
        'UM95'		=> -9.5,
        'UM9'		=> -9,
        'UM8'		=> -8,
        'UM7'		=> -7,
        'UM6'		=> -6,
        'UM5'		=> -5,
        'UM45'		=> -4.5,
        'UM4'		=> -4,
        'UM35'		=> -3.5,
        'UM3'		=> -3,
        'UM2'		=> -2,
        'UM1'		=> -1,
        'UTC'		=> 0,
        'UP1'		=> +1,
        'UP2'		=> +2,
        'UP3'		=> +3,
        'UP35'		=> +3.5,
        'UP4'		=> +4,
        'UP45'		=> +4.5,
        'UP5'		=> +5,
        'UP55'		=> +5.5,
        'UP575'		=> +5.75,
        'UP6'		=> +6,
        'UP65'		=> +6.5,
        'UP7'		=> +7,
        'UP8'		=> +8,
        'UP875'		=> +8.75,
        'UP9'		=> +9,
        'UP95'		=> +9.5,
        'UP10'		=> +10,
        'UP105'		=> +10.5,
        'UP11'		=> +11,
        'UP115'		=> +11.5,
        'UP12'		=> +12,
        'UP1275'	=> +12.75,
        'UP13'		=> +13,
        'UP14'		=> +14
    );

    if ($tz == '') {
      return $zones;
    }

    if ($tz == 'GMT')
      $tz = 'UTC';

    return ( ! isset($zones[$tz])) ? 0 : $zones[$tz];
  }
}


/* End of file date_helper.php */
/* Location: ./system/helpers/date_helper.php */